Dick,
If you profess to NOT know, which I suspect is NOT the case, do like the rest of us who are REALLY interested in understanding the real deal. Pick up the phone, ring AsA in Canberra, ask for a briefing and or/schedule a visit to the operational environment.
But don't forget, the guys and girls in ML Centre and the Tassie Towers are flat out with peak season traffic this time of year, refusal cannot be grounds for you to pretend to be shut out and/or offended!
And by the way, what do I do when launching into IMC at Hervey Bay with no clearance? And then have a one in one out?
Merry Christmas to you and all who live and play in the game of life and aviation.